The Howard T. Odum Florida Springs Institute (FSI) has found an alarming invasion of Blue tilapia that has replaced the native fish population in Silver Springs State Park based on a recent survey.

In 2019, Blue tilapia made up 25% of the fish biomass in Silver Springs but as of July this year numbers jumped to 86%.

According to Dr. Knight, “Native fish species are only at 41% of their population sizes prior to the Rodman/Kirkpatrick Dam’s completion in 1968, when populations collapsed.”

2021 study published in Science magazine found that biodiversity of over 50% of the world’s rivers has been seriously impacted by dams and the introduction of non-native fish species.

Currently, the St. Johns River Water Management District is collecting feedback from local community members and stakeholders regarding the Kirkpatrick Dam and Rodman Reservoir, with a focus on interests surrounding the dam’s environmental and economic impact. The form will be open until end of day Oct. 22.

Click this link to open the survey:


Source: UF/IFAS Pest Alert

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